Minor layout improvements to deploy in 0.0.2

[sickpig]

• [x] ~Stats table: on page load get the "COUNTRIES" table selected so that it would be more clear that also the node distributions by NETWORK and USER AGENT are available, i.e.~
• [x] ~Pie chart legend should be horizontally aligned with the graph.~
• [x] ~Put the timestamp in bold and add total number of nodes (in bold) on the same line.~
• [x] ~For the the text at the bottom use centered alignement~
• [x] Horizontally aligned "Powerd by Bitcoin Unlimited" with the bitcoin cash log and maybe add also BU logo https://www.bitcoinunlimited.info/img/bitcoin-unlimited.png
• [x] nodes table column width partitioned like this 35%,30%,17.5%,17.5%
• [x] mv "Showing 2647 out of 2647." up, so thta we can have the table nodes bigger
• [x] make nodes list more compact (less padding between nodes line)
• [x] mv user agent as first column of the stats table
• [x] put the gradation of the map to green only
• [x] use green for the shading/background of stats header

[sickpig]

completed